Lacking in power, Yue's civilian form Yukito can't sustain his energy. If Yue doesn't receive magical energy to fortify him, Yue and Yukito may both disappear. Yue discovers Clow Reed in Eriol's form and confronts him, but Eriol erases his memory and reverts him back to Yukito. Syaoran finally confesses his feelings for Sakura, but she doesn't hear because of a nearby panic when Yukito faints. When they're alone, Toya tells Yukito he knows he's not human, and Yue takes over so the two can have a conversation. Toya agrees to sacrifice his magic, including his ability to see his mother's spirit and sense when Sakura's in danger, in order to keep Yue and Yukito from disappearing from existence. Cards transformed: Erase, Earthy, and Shadow.
I loved the little CLAMP Easter egg of Kero reading an Angelic Layer book in this volume.